Differential Drag Anemometer for Autonomous Wind Measurement
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Solution Overview
Problem
Existing wind measurement technologies face challenges in accurately measuring wind speed and direction, particularly in difficult-to-reach locations or during adverse weather conditions, and often require complex setups or specialized equipment.
Innovation Solution
The development of an anemometer with a first portion and a second portion, each having different wind resistance characteristics due to variations in mass, shape, density, or freedom of motion, allowing it to incline and provide measurements of wind direction and speed as it falls through a fluid medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional anemometers (wind vanes, propeller anemometers, sonic anemometers) are used to measure wind speed and direction, then measurement capability is provided, but device complexity and/or susceptibility to adverse weather conditions increases
Solution Approach 1:
The anemometer is divided into two distinct portions: a first portion with lower wind resistance and a second portion with higher wind resistance. This segmentation allows each portion to contribute differently to the overall measurement function, with the high-wind-resistance portion providing the primary wind interaction and the low-wind-resistance portion serving as a reference, thereby achieving accurate wind measurement with a simpler overall structure compared to conventional multi-component anemometers.
Solution Approach 2:
Different portions of the anemometer are designed with different wind resistance characteristics - the first portion has lower wind resistance while the second portion has higher wind resistance. This local differentiation in quality (wind resistance) enables the device to function as a differential measurement system, where the relative movement between portions provides wind speed and direction information without requiring complex instrumentation.
2Measurement precision
If conventional anemometers are deployed in difficult-to-reach locations or adverse weather conditions, then wind measurement capability is maintained, but reliability and accuracy deteriorate
Solution Approach 1:
The invention replaces complex mechanical measurement systems (propellers, moving vanes, electronic sensors) with a passive mechanical indicator system. The anemometer uses the natural aerodynamic interaction between two portions with different wind resistances to automatically indicate wind direction and speed, eliminating the need for active mechanical components or electronic systems that are susceptible to failure in adverse weather conditions.
Solution Approach 2:
The anemometer is designed to be self-indicating, where the relative positioning of the two portions automatically provides wind measurement information without requiring external power sources, calibration, or active maintenance. The device uses the wind itself to drive the measurement indication, making it reliable in adverse conditions where powered systems might fail.
3Measurement precision
If complex anemometer setups are used to achieve accurate measurements, then measurement precision improves, but ease of operation and deployment deteriorates
Solution Approach 1:
The anemometer is designed as a simple, potentially disposable device that can be easily deployed and does not require complex setup or calibration procedures. The two-portion design with differential wind resistance provides accurate measurements through its basic mechanical configuration alone, eliminating the need for complex initialization or operational procedures associated with conventional anemometers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This innovative anemometer effectively measures wind speed and direction by utilizing its differential wind resistance portions to incline, providing accurate local wind parameter readings that can be transmitted to a remote location, suitable for applications such as aircraft landing assistance or firefighting.
Implementation Method 1
The second portion has at least one attribute resulting in a different wind resistance in the fluid medium than the first portion
Implementation Method 2
deployed to fall along a trajectory in the fluid medium
Data Source
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AI summary
Anemometer for independently measuring wind speed and direction in fluid medium. A second anemometer portion has at least one attribute resulting in different wind resistance in fluid medium than a first anemometer portion, such as a different: mass, shape, density, specific gravity, drag coefficient and/or freedom of motion. Different wind resistance causes inclination of anemometer when deployed to fall autonomously along a trajectory of fluid medium, where anemometer drag coefficient curtails initial ballistic trajectory such that anemometer enters free-fall descent after deployment. Anemometer includes inclinometer to obtain inclination measurements, and memory/transmitter to store/transmit inclination measurements. Local wind direction/speed is determined from inclination measurements based on direction/degree of anemometer inclination in correlation with measurement timings. Anemometer may be deployed from moving airborne platform. Anemometer may include conical second portion embedded into spherical first portion, where conical second portion has smaller mass and larger surface area than spherical first portion.